Daviteq Load Cell Transmitter
LC
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1. Giới thiệu
Daviteq load cell transmitter (LC) is a transmitter for 1 channel of load cell. The transmitter will be connected to an external 4-wire resistive bridge strain gauge load cell. The load cell input is adjustable sensitivity to ensure high resolution readings. The applications of the transmitter are weighing scales, towing loads and rope tension, structural stress measurement in metrology, web control, aerospace, medical devices, automotive testing, and manufacturing.
The LC can be integrated into the wireless transmitter from Daviteq, such as Sub-GHz WS433, LoRaWAN WSLRW, and Sigfox WSSFC, to build the complete wireless load cell transmitter.
Specifications
Input: 1 x Loadcell channel
Loadcell input: 4-wire resistive bridge loadcell (strain gauge loadcell)
Loadcell resolution: 0.000715mV
Loadcell linearity: INL error +-0.000357627 mV and DNL error +-0.000357627 mV
2. Nguyên tắc hoạt động
A load cell transmitter converts the small electrical signal from a load cell into a more robust signal that can be easily read and processed by other devices. Here's a simplified explanation of its operation:
- Signal Amplification: The load cell produces a small millivolt signal proportional to the applied load. The transmitter amplifies this signal to a higher voltage level (e.g., 0-10V) or current level (e.g., 4-20mA) for easier processing.
- Signal Conditioning: The transmitter conditions the signal to remove noise and ensure stability. This may include filtering and linearization to produce a clean, accurate output.
- Analog-to-Digital Conversion (if applicable): In digital transmitters, the amplified signal is converted into a digital format for transmission over digital communication protocols like RS232, RS485, or Ethernet.
- Output Transmission: The conditioned and amplified signal is then transmitted to a display, data acquisition system, or control system for further processing and monitoring.
This process ensures that the small, sensitive signal from the load cell is accurately and reliably transmitted for use in various applications.
3. Hiệu chuẩn
Follow below steps to calibrate load cell transmitter
Connect the external load cell to the load cell transmitter channels. Refer the wiring at section 1.8 INSTALLATION
Write the right sensitivity (mV/V) of the connected external load cell to LOADCELL_SENSITIVITY configuration of the transmitter.
Apply known weight to the external load cell, then force the sensor by magnetic key (details at above ) to send the FORCE uplink message and record corresponding sample RAW_WEIGHT (ADC value) of the load cell in FORCE uplink message and known weight.
Repeat step 3 for N know weights. N is number of calibration points and N is any number from 2 to 10.
Write N to corresponding LOADCELL_NUM_OF_CALIB_POINTS
Write N couple values of ADC values and known weight to corresponding LOADCELL_Xi and LOADCELL_Yi configurations (where i = 1 to N). Note that the values of LOADCELL_Xi and LOADCELL_Yi in the calibration table must be in ascending order.
4. Ghi chú ứng dụng
5. Installation Notes
- Choose the Right Frame and Fixture: Ensure the frame is sturdy and minimizes vibrations. The fixture should be designed to support the load cell properly.
- Align Loads Properly: Make sure the load is applied directly through the load cell to avoid force shunts, which can cause inaccurate readings.
- Environmental Factors: Consider temperature, humidity, and other environmental conditions that might affect the load cell's performance.
- Mounting Surface: The mounting surface should be flat and level to ensure accurate measurements.
- Avoid Overloading: Do not exceed the load cell's rated capacity to prevent damage.
- Cable Management: Secure and protect the load cell cables to avoid interference and damage.
- Regular Calibration: Periodically calibrate the load cell to maintain accuracy.
6. Troubleshooting
Some common steps to troubleshoot a load cell transmitter:
- Visual Inspection: Start by checking for any visible damage, corrosion, or loose connections on the load cell and its wiring.
- Excitation Voltage Check: Ensure the load cell is receiving the correct excitation voltage as specified by the manufacturer.
- Zero Balance Test: Disconnect the load cell and measure the output signal with no load applied. The output should be within the manufacturer's specified range.
- Bridge Resistance Test: Use an ohmmeter to measure the resistance between the load cell terminals. Compare these readings with the manufacturer's specifications to identify any discrepancies.
- Signal Output Test: Apply a known load to the cell and measure the output signal. Ensure the output is stable and within the expected range.
- Insulation Resistance Test: Check the insulation resistance between the load cell body and the signal wires to ensure there are no short circuits.
- Environmental Assessment: Consider environmental factors such as temperature changes, which can affect load cell performance. Shield the load cell from extreme temperatures if necessary.
- Creep Test: If the load cell is under constant load for long periods, it may exhibit creep. Monitor the load cell's output over time to check for this issue.
7. Maintenance
Maintaining a load cell transmitter is essential for ensuring accurate and reliable performance. Here are some key maintenance tips:
- Regular Calibration: Periodically calibrate the transmitter to maintain accuracy. Follow the manufacturer's guidelines for calibration intervals.
- Inspect Wiring and Connections: Regularly check the wiring and connections for any signs of wear, corrosion, or loose connections.
- Environmental Protection: Ensure the transmitter is protected from extreme temperatures, moisture, and corrosive substances. Use protective enclosures if necessary.
- Cleanliness: Keep the transmitter and its surroundings clean to prevent dust and debris from affecting its performance.
8. Cấu hình mặc định
Load cell transmitter has the default configuration. The user can change the configuration on the wireless transmitter so that the complete sensor (transducer + wireless) delivers the proper output value.